A device and method for detecting threads of a nodular cast iron camshaft

Abstract

This invention discloses a thread detection device and method for ductile iron camshafts, belonging to the field of thread detection technology. The positioning structure of the ductile iron camshaft thread detection device includes an upper positioning seat and a lower positioning seat coaxially arranged. The upper positioning seat is mounted on a sliding plate, and a lifting element that drives the sliding plate to rise and fall is mounted on a support frame. The lower positioning seat is mounted on the support frame. The thread detection gauge of the detection mechanism is rotatably and slidably disposed inside the upper positioning seat, coaxially arranged with the upper positioning seat. A rotary sliding structure that drives the thread detection gauge to rotate and slide is provided on the sliding plate. A torque sensor for detecting the torque of the thread detection gauge and a displacement sensor for detecting the displacement of the thread detection gauge are mounted on the rotary sliding structure. Both the torque sensor and the displacement sensor are electrically connected to a controller. This invention, using the above-mentioned ductile iron camshaft thread detection device and method, can improve the accuracy of ductile iron camshaft thread detection and reduce labor costs.

Description

Technical Field

[0001] This invention relates to the field of thread inspection technology, and in particular to a device and method for inspecting the threads of ductile iron camshafts. Background Technology

[0002] The camshaft is part of the engine's valve train, specifically responsible for driving the valves to open and close on time. Its function is to ensure that the engine draws in fresh combustible mixture into the cylinders at regular intervals and promptly expels exhaust gases after combustion. The main body of the camshaft is a cylindrical rod approximately the same length as the cylinder bank, with several cams fitted onto it to drive the valves. To facilitate camshaft assembly, a threaded hole is provided in the center bore of the camshaft end. The camshaft is assembled through this threaded hole, which is concentric with the camshaft.

[0003] Ductile iron possesses high strength and rigidity, enabling it to withstand high pressure and resist external loads. It also exhibits excellent corrosion resistance, making it resistant to rust and corrosion. Therefore, ductile iron is commonly used to manufacture camshafts. However, ductile iron has a wide eutectic solidification range, resulting in a broad liquid-solid coexistence region on the cross-section during solidification. Its solidification process is characterized by a porridge-like solidification pattern, making feeding during solidification difficult and prone to internal shrinkage cavities and porosity. Ductile iron also exhibits significant eutectic expansion force, which further contributes to internal shrinkage defects. When threading ductile iron camshafts, these internal shrinkage cavities and porosity defects affect the thread quality. Furthermore, the high strength and rigidity of ductile iron also influence the machining quality of the threaded holes on the camshaft and the coaxiality between the threaded holes and the camshaft. Therefore, for ductile iron camshafts, the quality, depth, and coaxiality inspection of the threaded holes are crucial steps.

[0004] Existing methods for inspecting threaded holes generally rely on manual inspection. This manual inspection is labor-intensive and has low accuracy, affecting the stability of the final camshaft quality. Furthermore, it doesn't provide a direct visual indication of the threaded hole's quality and is unsuitable for rework or adjustment. Summary of the Invention

[0005] The purpose of this invention is to provide a device and method for detecting the threads of ductile iron camshafts, thereby improving the accuracy of thread detection on ductile iron camshafts and reducing labor costs.

[0006] To achieve the above objectives, the present invention provides a thread detection device for ductile iron camshafts, comprising:

[0007] Support frame;

[0008] The positioning structure includes an upper positioning seat and a lower positioning seat arranged coaxially. The upper and lower positioning seats are used to position and fix the two ends of the camshaft. The upper positioning seat is set on the slide plate, and the support frame is equipped with a lifting element that drives the slide plate to rise and fall. The lower positioning seat is set on the support frame.

[0009] The testing mechanism includes a thread gauge, which is rotatably and slidably mounted inside an upper positioning seat. The thread gauge is coaxially mounted with the upper positioning seat. A rotary sliding structure is mounted on the slide plate to drive the thread gauge to rotate and slide. A torque sensor for detecting the torque of the thread gauge and a displacement sensor for detecting the displacement of the thread gauge are mounted on the rotary sliding structure. Both the torque sensor and the displacement sensor are electrically connected to the controller.

[0010] Preferably, the support frame includes a base, a top plate is provided above the base, and the base and the top plate are connected by a vertically arranged guide rod; the lower positioning seat is provided on the base.

[0011] Preferably, the lifting element is a cylinder, which is mounted on the top plate. The piston rod of the cylinder is connected to the slide plate, and the cylinder is located at both ends of the slide plate. The cylinder is electrically connected to the controller. A guide sleeve is provided at the end of the slide plate to guide the sliding of the slide plate. The guide sleeve is located outside the guide rod and is slidably connected to the guide rod.

[0012] Preferably, the rotary sliding structure includes a rotary rod, one end of which is provided with a power element that drives the rotary rod to rotate. A torque sensor and a displacement sensor are both provided on the rotary rod. A thread gauge is coaxially provided at the bottom end of the rotary rod. The upper positioning seat is provided with a through hole through which the rotary rod passes. The rotary rod is rotatably and slidably connected to the through hole. The sliding plate is provided with a guide structure that guides the sliding of the rotary rod.

[0013] Preferably, the power element is a motor, the output shaft of the motor is coaxially and fixedly connected to the rotating rod, the motor is fixedly mounted on the mounting plate, and the motor is electrically connected to the controller.

[0014] Preferably, the guide structure includes a mounting plate, a power element is mounted on the mounting plate, a rotating rod is rotatably connected to the mounting plate, a vertical slide bar is provided on the mounting plate, a sliding hole is provided on the sliding plate for the slide bar to pass through, the slide bar is slidably connected to the sliding hole, a limit plate is provided at the bottom end of the slide bar, and a first spring is provided between the mounting plate and the sliding plate, the first spring being sleeved on the outside of the slide bar.

[0015] Preferably, a sliding sleeve is provided in the through hole of the upper positioning seat, and a hole is provided in the center of the sliding sleeve for the rotating rod to pass through. The rotating rod is rotatably and slidably connected to the sliding sleeve, and the sliding sleeve is slidably connected to the upper positioning seat on the same axis. The bottom end of the sliding sleeve protrudes from the upper positioning seat, and an upper conical surface is provided on the side wall of the sliding sleeve. A second spring is provided between the top end of the sliding sleeve and the sliding plate. A groove for mounting the upper top plate is provided on the side wall of the upper positioning seat. An upper push rod is provided in the middle of the upper top plate. A sliding hole is provided in the groove for the upper push rod to pass through. The upper push rod is slidably connected to the sliding hole. A third spring is provided between the upper top plate and the groove. The upper push rod contacts the upper conical surface under the action of the third spring.

[0016] Preferably, the lower positioning seat has a mounting hole for mounting a push rod at its center. The push rod is slidably connected to the mounting hole. The top end of the push rod protrudes from the lower positioning seat, and the bottom end of the push rod is connected to the base via a fourth spring. The bottom of the push rod has a lower conical surface. The side wall of the lower positioning seat has several lower top plates for pressing the camshaft. A lower push rod is provided in the middle of the lower top plate. The lower positioning seat has a mounting groove for mounting the lower top plate. A hole is provided in the mounting groove for the lower push rod to pass through. The lower push rod is slidably connected to the hole. A fifth spring is provided between the lower top plate and the mounting groove to make the end of the lower push rod contact the lower conical surface.

[0017] Preferably, a barcode scanner is installed on the support frame, and the barcode scanner is electrically connected to the controller.

[0018] The testing method of the above-mentioned ductile iron camshaft thread testing device includes the following steps:

[0019] S1. Scan the process code on the camshaft with a barcode scanner to view the machining process and parameters of the camshaft;

[0020] S2. With the threaded end of the camshaft facing upwards, insert the other end of the camshaft into the lower positioning seat; activate the cylinder, which drives the slide plate to slide downwards, and the slide plate drives the upper positioning seat to slide downwards simultaneously, inserting the upper positioning seat into the center hole at the top of the camshaft; the slide plate continues to press down, and the top of the camshaft applies an upward thrust to the sliding sleeve, causing the sliding sleeve to slide upwards. The sliding sleeve pushes the upper push rod and the upper top plate outwards through the upper conical surface, and the upper top plate presses against the inner wall of the center hole at the top of the camshaft; the bottom of the camshaft applies a downward thrust to the push rod, and the push rod pushes the lower push rod and the lower top plate outwards through the lower conical surface, and the lower top plate presses against the inner wall of the center hole at the bottom of the camshaft, thus fixing the camshaft;

[0021] S3. Start the motor. The motor drives the rotating rod to rotate, and the rotating rod drives the thread inspection gauge to rotate synchronously. The thread inspection gauge engages with the threaded hole of the center hole at the top of the camshaft. The thread inspection gauge drives the rotating rod to move down. The displacement sensor detects the moving distance of the thread inspection gauge, and the torque sensor detects the torque of the thread inspection gauge to detect the quality of the threaded hole.

[0022] S4. The motor reverses, and the thread gauge rotates out of the threaded hole; the cylinder drives the slide plate to slide upward, the push rod moves upward under the action of the fourth spring, and the lower top plate slides inward under the action of the fifth spring; the sliding sleeve moves downward under the action of the second spring, and the upper top plate slides inward under the action of the third spring, removing the camshaft from the upper and lower positioning seats; the test results are uploaded to the controller.

[0023] The advantages and positive effects of the ductile iron camshaft thread detection device and method described in this invention are:

[0024] 1. Setting a thread inspection gauge at the center of the upper positioning seat and setting a torque sensor and a displacement sensor on the rotating rod can more accurately and intuitively detect the quality of the threaded hole, improve the quality of the camshaft, and facilitate the rework of the threaded hole.

[0025] 2. An upper top plate is installed on the upper positioning seat, and a lower top plate is installed on the lower positioning seat. When the base and slide plate press the two ends of the camshaft, the upper and lower top plates center and press the camshaft to ensure the coaxiality between the threaded hole and the upper and lower positioning seats, thereby improving the accuracy of the test.

[0026] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of an embodiment of the thread detection device and method for ductile iron camshafts according to the present invention;

[0028] Figure 2 This is a schematic diagram of the detection mechanism structure of an embodiment of the ductile iron camshaft thread detection device and detection method of the present invention;

[0029] Figure 3 This is a schematic diagram of the longitudinal section of the upper positioning seat in an embodiment of the thread detection device and method for ductile iron camshafts of the present invention.

[0030] Figure 4 This is a schematic diagram of the longitudinal section of the lower positioning seat in an embodiment of the thread detection device and method for ductile iron camshafts of the present invention.

[0031] Figure 5 This is a schematic diagram of the cross-sectional structure of the lower positioning seat in an embodiment of the ductile iron camshaft thread detection device and detection method of the present invention.

[0032] Figure Labels

[0033] 1. Base; 2. Top plate; 3. Slide plate; 4. Cylinder; 5. Barcode scanner; 6. Upper positioning seat; 7. Lower positioning seat; 8. Guide sleeve; 9. Guide rod; 10. Mounting plate; 11. Motor; 12. Rotating rod; 13. Torque sensor; 14. Displacement sensor; 15. Slide rod; 16. First spring; 17. Limiting plate; 18. Slide sleeve; 19. Thread inspection gauge; 20. Upper top plate; 21. Second spring; 22. Upper push rod; 23. Third spring; 24. Upper conical surface; 25. Push rod; 26. Fourth spring; 27. Lower conical surface; 28. Lower top plate; 29. ​​Lower push rod; 30. Fifth spring; 31. Mounting groove; 32. Mounting hole. Detailed Implementation

[0034] The technical solution of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0035] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0036] Example

[0037] like Figure 1 As shown, a ductile iron camshaft thread inspection device includes a support frame, a positioning structure, and an inspection mechanism. The support frame includes a base 1, and a top plate 2 is disposed above the base 1. The base 1 and the top plate 2 are fixedly connected by a vertically arranged guide rod 9. The support frame provides support for the entire device.

[0038] The positioning structure includes an upper positioning seat 6 and a lower positioning seat 7 coaxially arranged, which are used to position and fix the two ends of the camshaft. The upper positioning seat 6 is fixedly mounted on the slide plate 3, and a lifting element that drives the slide plate 3 to rise and fall is provided on the support frame. In this embodiment, the lifting element is a cylinder 4, which is electrically connected to the controller. The cylinder 4 is fixedly mounted on the top plate 2, and the piston rod of the cylinder 4 is connected to the fixed slide plate 3. The cylinder 4 is located at both ends of the slide plate 3 to improve the stability of the slide plate 3. A guide sleeve 8 that guides the sliding of the slide plate 3 is fixedly mounted on the end of the slide plate 3. The guide sleeve 8 is located outside the guide rod 9 and is slidably connected to the guide rod 9.

[0039] like Figure 2 As shown, the inspection mechanism includes a thread gauge 19, which is adapted to the threaded hole to be inspected. The thread gauge 19 is used to check whether the size, depth, and coaxiality of the threaded hole meet the requirements. A rotary sliding structure is provided on the slide plate 3 to drive the thread gauge 19 to rotate and slide. The rotary sliding structure includes a rotating rod 12, one end of which is equipped with a motor 11 that drives the rotating rod 12 to rotate. The output shaft of the motor 11 is coaxially and fixedly connected to the rotating rod 12. The motor 11 is fixedly mounted on the mounting plate 10 and is electrically connected to the controller. A through hole is provided on the slide plate 3 for the rotating rod 12 to pass through, and the rotating rod 12 is rotatably connected to the through hole. The thread gauge 19 is coaxially fixedly mounted at the bottom end of the rotating rod 12. A torque sensor 13 and a displacement sensor 14 are provided on the rotating rod 12, both of which are electrically connected to the controller. Torque sensor 13 is used to detect the torque of thread gauge 19, and displacement sensor 14 is used to detect the distance the thread gauge 19 moves, thereby providing a direct and accurate inspection of the quality of the threaded hole. Existing models of torque sensor 13 and displacement sensor 14 are used as needed.

[0040] Both the upper positioning seat 6 and the slide plate 3 are provided with through holes through which the rotating rod 12 passes, and the rotating rod 12 is rotatably slidably connected to the through holes. The slide plate 3 is provided with a guide structure that guides the sliding of the rotating rod 12. The guide structure includes a mounting plate 10, and a motor 11 is fixedly mounted on the mounting plate 10. The mounting plate 10 is provided with through holes through which the rotating rod 12 passes, and the rotating rod 12 is rotatably connected to the through holes. A vertical slide rod 15 is fixedly mounted on the mounting plate 10, and a sliding hole is provided on the slide plate 3 through which the slide rod 15 passes, and the slide rod 15 is slidably connected to the sliding hole. A limit plate 17 is fixedly mounted at the bottom end of the slide rod 15 to prevent the slide rod 15 from slipping off the slide plate 3. A first spring 16 is provided between the mounting plate 10 and the slide plate 3, and the first spring 16 is sleeved on the outside of the slide rod 15.

[0041] like Figure 3As shown, a sliding sleeve 18 is slidably disposed within the through hole of the upper positioning seat 6. A hole is provided at the center of the sliding sleeve 18 for the rotating rod 12 to pass through, and the rotating rod 12 is slidably connected to the sliding sleeve 18. The sliding sleeve 18, rotating rod 12, thread gauge 19, and upper positioning seat 6 are coaxially arranged. The bottom end of the sliding sleeve 18 protrudes from the upper positioning seat 6, and an upper conical surface 24 is provided on the side wall of the sliding sleeve 18. A second spring 21 is provided between the top end of the sliding sleeve 18 and the slide plate 3, and both ends of the second spring 21 are fixedly connected to the slide plate 3 and the sliding sleeve 18, respectively. A groove for mounting an upper top plate 20 is provided on the side wall of the upper positioning seat 6. The upper top plates 20 are arranged in a circumferential array around the upper positioning seat 6 to center and fix the top end of the camshaft, ensuring the coaxiality between the camshaft and the upper positioning seat 6. An upper push rod 22 is provided in the middle of the upper top plate 20, and a sliding hole is provided within the groove for the upper push rod 22 to pass through, and the upper push rod 22 is slidably connected to the sliding hole. A third spring 23 is provided between the upper top plate 20 and the groove, with both ends of the third spring 23 fixedly connected to the upper top plate 20 and the groove, respectively. The upper push rod 22 contacts the upper conical surface 24 under the action of the third spring 23. The upper conical surface 24 pushes the upper top plate 20 to slide, so as to abut against the inner wall of the camshaft, thereby positioning and fixing the camshaft.

[0042] like Figure 4 , 5 As shown, the lower positioning seat 7 is fixedly mounted on the base 1. The lower positioning seat 7 has a mounting hole 32 at its center for mounting a push rod 25, and the push rod 25 is slidably connected to the mounting hole 32. The top end of the push rod 25 protrudes from the lower positioning seat 7, and the bottom end of the push rod 25 is connected to the base 1 via a fourth spring 26. The bottom of the push rod 25 has a lower conical surface 27. Several lower top plates 28 are provided on the side wall of the lower positioning seat 7, and a lower push rod 29 is fixedly mounted in the middle of each lower top plate 28. The lower top plates 28 are arranged in a circumferential array around the lower positioning seat 7 to center and fix the bottom end of the camshaft, ensuring coaxiality between the camshaft and the lower positioning seat 7. The lower positioning seat 7 has a mounting groove 31 for mounting the lower top plates 28, and a hole is provided in the mounting groove 31 for the lower push rod 29 to pass through, with the lower push rod 29 slidably connected to the hole. A fifth spring 30 is provided between the lower top plate 28 and the mounting groove 31, which makes the end of the lower push rod 29 contact the lower conical surface 27. The two ends of the fifth spring 30 are fixedly connected to the lower top plate 28 and the mounting groove 31, respectively. The push rod 25 pushes the lower top plate 28 outward through the lower conical surface 27, thereby pressing it against the inner wall of the center hole at the bottom of the camshaft, and positioning and fixing the bottom of the camshaft.

[0043] A barcode scanner 5 is installed on the support frame and is electrically connected to the controller. By scanning the process code on the camshaft with the barcode scanner 5, the machining process of the camshaft can be viewed, and the operator, operating equipment, specific parameters and test results can be recorded to establish a file for subsequent inspection of the camshaft's inspection structure and to prevent unqualified products from being mixed in.

[0044] The testing method of the above-mentioned ductile iron camshaft thread testing device includes the following steps:

[0045] S1. Scan the process code on the camshaft using barcode scanner 5 to view the machining process and parameters of the camshaft.

[0046] S2. With the threaded end of the camshaft facing upwards, insert the other end of the camshaft into the lower positioning seat 7. Activate cylinder 4, which drives slide plate 3 downwards. Slide plate 3 drives upper positioning seat 6 downwards simultaneously, inserting it into the center hole at the top of the camshaft. Slide plate 3 continues to press down, applying an upward thrust to the sliding sleeve 18 at the top of the camshaft. The sliding sleeve 18 slides upwards, pushing the upper push rod 22 and upper top plate 20 outwards via the upper conical surface 24. The upper top plate 20 presses firmly against the inner wall of the center hole at the top of the camshaft. The bottom end of the camshaft applies a downward thrust to the push rod 25, which pushes the lower push rod 29 and lower top plate 28 outwards via the lower conical surface 27. The lower top plate 28 presses firmly against the inner wall of the center hole at the bottom of the camshaft, completing the fixation of the camshaft.

[0047] S3. Start motor 11. Motor 11 drives rotating rod 12 to rotate. Rotating rod 12 drives thread gauge 19 to rotate synchronously. Thread gauge 19 engages with the threaded hole of the center hole at the top of the camshaft. Thread gauge 19 drives rotating rod 12 to move downward. Displacement sensor 14 detects the moving distance of thread gauge 19, and torque sensor 13 detects the torque of thread gauge 19. The size, depth, and coaxiality of the threaded hole are detected.

[0048] S4. Motor 11 reverses direction, and thread gauge 19 rotates out of the threaded hole. Cylinder 4 drives slide plate 3 to slide upward, push rod 25 moves upward under the action of fourth spring 26, and lower top plate 28 slides inward under the action of fifth spring 30. Sliding sleeve 18 moves downward under the action of second spring 21, and upper top plate 20 slides inward under the action of third spring 23, removing the camshaft from upper positioning seat 6 and lower positioning seat 7. The test results are uploaded to the controller.

[0049] If the quality of the threaded hole fails the inspection, manual intervention is carried out by removing the camshaft from the inspection device and setting it aside.

[0050] In this invention, the specific connection methods of the motor, cylinder, displacement sensor, torque sensor, barcode scanner and controller can adopt existing technologies as needed.

[0051] Therefore, the present invention employs the above-mentioned ductile iron camshaft thread detection device and detection method, which can improve the accuracy of ductile iron camshaft thread detection and reduce labor costs.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solutions of the present invention, and these modifications or equivalent substitutions cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A device for detecting the thread of a ductile iron camshaft, characterized in that: include: Support frame; The positioning structure includes an upper positioning seat and a lower positioning seat arranged coaxially. The upper and lower positioning seats are used to position and fix the two ends of the camshaft. The upper positioning seat is set on the slide plate, and the support frame is equipped with a lifting element that drives the slide plate to rise and fall. The lower positioning seat is set on the support frame. A sliding sleeve is provided in the through hole of the upper positioning seat. A hole is provided in the center of the sliding sleeve for the rotating rod to pass through. The rotating rod is slidably connected to the sliding sleeve. The sliding sleeve is slidably connected to the upper positioning seat on the same axis. The bottom end of the sliding sleeve protrudes from the upper positioning seat. An upper conical surface is provided on the side wall of the sliding sleeve. A second spring is provided between the top end of the sliding sleeve and the sliding plate. A groove for installing the upper top plate is provided on the side wall of the upper positioning seat. An upper push rod is provided in the middle of the upper top plate. A sliding hole is provided in the groove for the upper push rod to pass through. The upper push rod is slidably connected to the sliding hole. A third spring is provided between the upper top plate and the groove. The upper push rod contacts the upper conical surface under the action of the third spring. The lower positioning seat has a mounting hole for mounting a push rod at its center. The push rod is slidably connected to the mounting hole. The top end of the push rod protrudes from the lower positioning seat, and the bottom end of the push rod is connected to the base through a fourth spring. The bottom of the push rod has a lower conical surface. The side wall of the lower positioning seat has several lower top plates for pressing the camshaft. The middle of the lower top plate has a lower push rod. The lower positioning seat has a mounting groove for mounting the lower top plate. The mounting groove has a hole for the lower push rod to pass through. The lower push rod is slidably connected to the hole. A fifth spring is provided between the lower top plate and the mounting groove to make the end of the lower push rod contact the lower conical surface. The testing mechanism includes a thread gauge, which is rotatably and slidably mounted inside an upper positioning seat. The thread gauge is coaxially mounted with the upper positioning seat. A rotary sliding structure is mounted on the slide plate to drive the thread gauge to rotate and slide. A torque sensor for detecting the torque of the thread gauge and a displacement sensor for detecting the displacement of the thread gauge are mounted on the rotary sliding structure. Both the torque sensor and the displacement sensor are electrically connected to the controller.

2. The ductile iron camshaft thread detection device according to claim 1, characterized in that: The support frame includes a base, a top plate is provided above the base, and the base and the top plate are connected by a vertically arranged guide rod; the lower positioning seat is provided on the base.

3. The ductile iron camshaft thread detection device according to claim 2, characterized in that: The lifting element is a cylinder, which is installed on the top plate. The piston rod of the cylinder is connected to the slide plate. The cylinder is located at both ends of the slide plate and is electrically connected to the controller. A guide sleeve is provided at the end of the slide plate to guide the sliding of the slide plate. The guide sleeve is located outside the guide rod and is slidably connected to the guide rod.

4. The ductile iron camshaft thread detection device according to claim 3, characterized in that: The rotary sliding structure includes a rotary rod, one end of which is provided with a power element that drives the rotary rod to rotate. A torque sensor and a displacement sensor are both provided on the rotary rod. A thread gauge is coaxially provided at the bottom end of the rotary rod. The upper positioning seat is provided with a through hole through which the rotary rod passes. The rotary rod is rotatably and slidably connected to the through hole. The sliding plate is provided with a guide structure that guides the sliding of the rotary rod.

5. The ductile iron camshaft thread detection device according to claim 4, characterized in that: The power element is a motor. The output shaft of the motor is coaxially and fixedly connected to the rotating rod. The motor is fixedly mounted on the mounting plate and electrically connected to the controller.

6. The ductile iron camshaft thread detection device according to claim 5, characterized in that: The guide structure includes a mounting plate, a power element mounted on the mounting plate, a rotating rod rotatably connected to the mounting plate, a vertical slide rod on the mounting plate, a sliding hole on the slide plate for the slide rod to pass through, the slide rod slidably connected to the sliding hole, a limit plate at the bottom end of the slide rod, and a first spring between the mounting plate and the slide plate, the first spring being sleeved on the outside of the slide rod.

7. The ductile iron camshaft thread detection device according to claim 6, characterized in that: The support frame is equipped with a barcode scanner, which is electrically connected to the controller.

8. A detection method based on the ductile iron camshaft thread detection device according to claim 7, characterized in that, Includes the following steps: S1. Scan the process code on the camshaft with a barcode scanner to view the machining process and parameters of the camshaft; S2. With the threaded end of the camshaft facing upwards, insert the other end of the camshaft into the lower positioning seat; activate the cylinder, which drives the slide plate to slide downwards, and the slide plate drives the upper positioning seat to slide downwards simultaneously, inserting the upper positioning seat into the center hole at the top of the camshaft; the slide plate continues to press down, and the top of the camshaft applies an upward thrust to the sliding sleeve, causing the sliding sleeve to slide upwards. The sliding sleeve pushes the upper push rod and the upper top plate outwards through the upper conical surface, and the upper top plate presses against the inner wall of the center hole at the top of the camshaft; the bottom of the camshaft applies a downward thrust to the push rod, and the push rod pushes the lower push rod and the lower top plate outwards through the lower conical surface, and the lower top plate presses against the inner wall of the center hole at the bottom of the camshaft, thus fixing the camshaft; S3. Start the motor. The motor drives the rotating rod to rotate, and the rotating rod drives the thread inspection gauge to rotate synchronously. The thread inspection gauge engages with the threaded hole of the center hole at the top of the camshaft. The thread inspection gauge drives the rotating rod to move downward. The displacement sensor detects the moving distance of the thread inspection gauge, and the torque sensor detects the torque of the thread inspection gauge. The size, depth and coaxiality of the threaded hole are detected. S4. The motor reverses, and the thread inspection gauge rotates out of the threaded hole. The cylinder drives the slide plate to slide upward, the push rod moves upward under the action of the fourth spring, and the lower top plate slides inward under the action of the fifth spring; The sliding sleeve moves downward under the action of the second spring, and the upper top plate slides inward under the action of the third spring, removing the camshaft from the upper and lower positioning seats; the detection results are then uploaded to the controller.

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